Narrow shelf



FIG. 1 is a front perspective view of the narrow shelf showing my new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a side perspective view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a back elevation view thereof.

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a left side elevation view, the right side elevation being the mirror image thereof. 

CLAIM The ornamental design for a narrow shelf, as shown and described. 